Cellulose wool and paper product



May 2; 1933. THUNERT 906,671

CELLULOSE WOOL AND PAPER PRODUCT Filed Jan.. 28. 1927 I VENTOR,

Patented May 2, 1933 UNITED STATES FELIX THUNE BT, 0F LEIPZIG, GERMANY CELLULOSE WOOL AND PAPER PRODUCT App11cation filed January 28, 1927, Serial No.

It is well known that fancy papers for industrial purposes are made by applying one or more layers of tissue or crepe paper to a firm layer of paper.

The process described in this invention differs from the aforesaid commonly known one in that cellulose wool is applied by means of adhesive to a layer of aper serving as a base. By cellulose woo is understood a flake-like layer of cellulose pro-. duced in a paper making machine and consisting only of fine threads adhering together; this layer of cellulose differs from crepe and tissue paper by having a considerably looser structure. The advantage of using cellulose wool in the aforesaid process of making fancy papers is that the surface of the paper becomes very soft and downy, and that a much thicker and looser cellulose 0 layer can be applied to the firm paper ,layer,

so that much deeper stamping of the cellulose layer is possible and a very great relief effect of the paper obtained.

The cellulose wool can be applied to. the paper layer in different ways. The adhesive can be applied to the paper layer in any of the known ways, as. for example, by pressing or dabbing and the cellulose wool then pressed upon the paper. But one or several layers of the cellulose wool can be spread over layer of paper free from adhesive and the adhesive applied afterwards when it will penetrate through the layer of cellulose wool. to the paper underneath.

As the cellulose wool has a great absorbing capacity several layers of cellulose can be connected with the underlayer without applying fresh adhesive.

Owing to the exceedingly loose structure of the cellulose wool there is a danger of i the adhesive penetrating through the layer of cellulose, while the latter is being pressed on to the paper underlayer, to the agents used for pressing, adhering to the cellulose and tearing it. When pressing it is there fore advisable to use a sieve, wire net or the like, which is to be placed-between the cellulose wool and the agents used for :pressing, in order to keep the surfaces to which the flat cellulose wool layer. In the process 164,243, and in Germany December 23, 1924. D

the cellulose wool could adhere as small as possible.

For pressing any stamping plate or roller with a pattern on it can be employed, and which leaves its impression on the cellulose 5 W001 la er and causes a firm connection between t e cellulose wool layer and the firm underlayer of paper at the places where the stamp or roller produces the deepest pressure.

If it is desired to roduce a paper witha particularly soft and loose structure in the cellulose layer a very small quantity of adhesive must be applied to the paper underlayer, and the-cellulose wool applied to the paper underlayer in such a manner that the upper cellulose wool layers lie flat and adhere loosely. Colourless or colored adhesive is then sprayed or dabbed from above onto of absorbing thev adhesive the flat layer of cellulose wool becomes crinkled, remaining in this condition when the paper dries. At the same time the upper layers of cellulose wool, which hitherto had only been loosely connected with lower layers, become more tightly joined to the latter. By' using different colours of adhesive a great variety of coloured effects can be obtained, and this can be enhanced by pressing colours onto the paper afterwards or by spraying colours, bronze powder or the like from above obliquely on to the loose upper layer.

If it is desired only to adhere one layer of cellulose wool to the paper layer, coloured or colourless adhesive is applied to the paper in such a manner that it only covers the latter in places or it can be applied in the form of any desired pattern. The cellulose wool layer then laid on adheres only tothe places where the adhesive has been applied, and remains fiat in the other places. If adhesive of any colour is then sprayed on or applied in some other suitable manner to the cellulose wool layer the latter will crinkle or form into folds during the drying process, and these folds generally run in the directi n of the cellulose fibres.

The work can also be done mechanically. In the drawing, Fig. 1 gives a schematic example of an appliance for using the process. Fig. 2 illustrates another form of appliance for carrying out the process.

In the drawing a is a paper Web which unwinds from a roller 6 and runs over a roller 9. 0 and e are webs of cellulose wool which unwind from rollers d and f and are also led over the roller 9 in such a manner that they lie on the upper side of the paper web serving as underlayer.

In an adhesive container h is immersed a roller 2' covered with cloth, felt or the like sheathed in a sieve or wire net is and touches the roller 9 or the outer cellulose wool webs guided by it. This causes adhesive to ooze out of the material with which the roller 2' is covered; the adhesive passes throu h the sieve or wire net onto the cellulose woo webs e and 0 running over the roller 9 and paper web a. The sieve or wire net presses at the same time the cellulose wool layers onto the paper web. The cellulose wool does not adhere to the adhesive applying roller because the cylindrical sieve or gratin surrounding the adhesive applying roller 0 ers only small iurfaces to which the cellulose wool can adere.

The downycovering formed by the cellulose wool layers on the paper absorbs in its contact with the adhesive applying roller 2' sufiicient quantities of adhesive that it is able to connect further cellulose wool layers with itself, the further layers being conveyed to it from the reels Z, m. The connection with the lower layers is done by a pressure roller n.

This roller can be made as a relief stamping roller, so that it produces a pattern on the cellulose wool covering of the paper web a, and naturally a firmer connection of the different webs at the deeply stamped places.

The schematic example given in Fig. 2 differs from the one outlined above in that the adhesive applying roller i immersed in the adhesive container touches the paper web a and applies adhesive to it before the cellulose wool webs a, e unwinding from the rollers d, f are brought into contact with the paper web on the roller g. A press roller n presses the cellulose wool webs 0', c with a light pressure on to the paper web a. The paper Web runs with the losely attaching cellulose layers over a guide roller Z and over an undersupport o to a guide roller m. Whilst the paper web is running over the support 0 it is sprayed with coloured or uncoloured adhesive emitted by nozzle tubes. From the roller m the composite web runs to the drying room or through a drying attachment. The circumference of the adhesive applying roll er can be made in relief 'form, so that the adhesive is applied to the paper web in any desired pattern.-

I claim:

An article of manufacture comprising a sheet serving as a base layer and a substansignature.

FELIX THUNERT. 

